Crown MPX-6 User Manual

Page 19

IQ Mixer / Multiplexer  Hardware Installation

Rev. 0

Fig. 3.22  A 12x8 Mixer Using 8 Mixer/Multiplexers

By using several units and a combination of parallel
inputs and stacked outputs, larger mixing configu-
rations (12x8, 24x4, etc.) can be created as shown
below:

Auxiliary devices, external to the 

IQ System, can be

turned on and off using the Aux port on the mixer/
multiplexer. For example, auxiliary cooling for an
amplifier equipment rack can be controlled using
the Aux port to control a solid state relay which in
turn controls a cooling fan. This is shown below in
Figure 3.23:

Fig. 3.23  Sample Auxiliary System Wiring

maximum of 16 mA. This is shown below in Figure
3.24.

Notice in Figure 3.24 that the Aux port also has the
capability to receive a signal across pins 2 (+) and
1 (ground). It is a high impedance input and in-
cludes a pull-down resistor.

Fig. 3.24  Internal Auxiliary Circuit

MAIN

OUT

STACK
IN

PARALLELED

INPUTS

STACKED

OUTPUTS

The solid state relay shown (Crown part number C
7308-7) can be ordered from Crown.

The Aux port uses a male 3-pin mini XLR connector
which is located above the DB25 connector (Figure
2.1). Use a Switchcraft

®

 TA3F cable connector or

equivalent to make the connection.

When the Aux port is turned on by the 

IQ System it

provides 10 VDC across pins 3 (+) and 1 (ground).
An internal 1500 ohm resistor limits the current to a